[PATCH 1/1] Improved whirlpool hash performance

[And Sch]

Benchmark on different systems:

Intel(R) Atom(TM) CPU N570   @ 1.66GHz
before:
Hash:
                |  nanosecs/byte   mebibytes/sec   cycles/byte
 WHIRLPOOL      |     63.40 ns/B     15.04 MiB/s         - c/B
after:
Hash:
                |  nanosecs/byte   mebibytes/sec   cycles/byte
 WHIRLPOOL      |     46.21 ns/B     20.64 MiB/s         - c/B

Intel(R) Core(TM) i5-4670 CPU @ 3.40GHz
before:
Hash:
                |  nanosecs/byte   mebibytes/sec   cycles/byte
 WHIRLPOOL      |      7.75 ns/B     123.0 MiB/s         - c/B
after:
Hash:
                |  nanosecs/byte   mebibytes/sec   cycles/byte
 WHIRLPOOL      |      6.70 ns/B     142.3 MiB/s         - c/B

This one actually shows greater improvement on the Atom system.

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